Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apjs...70..623g&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 70, July 1989, p. 623-636. Research supported by NSERC.
Astronomy and Astrophysics
Astrophysics
109
A Stars, Astronomical Catalogs, Early Stars, Stellar Rotation, Stellar Spectrophotometry, Stellar Luminosity, Stellar Temperature, Ubv Spectra
Scientific paper
The MK spectral classification for late A-type stars is refined and the effects of rotation of spectral classification and uvby(beta) photometry for these stars are examined. It is found that, for A3 stars, the 4417/4481 A wavelength ratio produces results that are inconsistent with the Stark broadening of the H lines. It is suggested that this ratio is not useful as a luminosity criterion at any spectral type. Self-consistent sequences of narrow- and broadline standards are established. The results of the refined classification system are compared with Stromgren photometry, showing a set of low-v sin i A-type stars with anomalously large delta(c1) indices for their luminosity types. It is proposed that these stars are rapid rotators seen at fairly low inclination angles.
Garrison Robert F.
Gray Richard O.
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